Report: Mel Gibson Launches "N-Word," F-Bomb Tirade at Ex

In newly surfaced audio, a man who apparently sounds like Mel Gibson is heard crudely screaming at a woman, believed to be his ex Oksana Grigorieva.

"You're an embarrassment to me!" the man yells at one point, according to RadarOnline.com, which first broke the story Thursday. "You look like a f--king pig in heat, and if you get raped by a pack of n-----s, it will be your fault."

Both Radar and TMZ.com claim the man is 54-year-old Gibson --- who famously spewed anti-Semitic slurs during a July 2006 DUI arrest -- but neither the actor nor his lawyers have confirmed their reports. Reps for Grigorieva, 40, also have not confirmed the reports.

The news comes as Gibson and Grigorieva are engaged in an ugly public battle over their daughter, Lucia, who was born in October.

On June 21, Grigorieva filed a restraining order against Gibson, alleging that he punched her in the face and knocked out her teeth Jan. 6. A Gibson source tells Us Weekly: "They got into it, but he absolutely did not injure her."

Grigorieva (who has son Alexander, 12, with actor Timothy Dalton) claims Gibson — worth a reported $900 million — is refusing to give her child support and forcing her to rack up debt. "I am having to live on credit cards," she told the U.K.’s Daily Mail June 26.

Last year, Gibson divorced his wife of 28 years, Robyn, with whom he has seven children. The two reportedly had no prenup, which means she walked away with about $450 million.